Triple-needle sewing-machine.



A. R. LARSON.

TRIPLE NEEDLE SEWING MACHINE. APPLICATION FILED MAY 26, 1914.

1,169,972. I Patented Feb. 1, 1916.

2 SHEETS-SHEET I.

WITNESSES; INVENTOH 6 (m BY ,4 TTORNE Y A. R. LARSON.

TRIPLE NEEDLE SEWING MACHINE.

APPLICATION FILED MAY 26. 1914.

2 SHEETS-SHEET 2.

1,169,972. Patented Feb. 1, 1916.

I I I] II II l l III II lUll W W E5: f r \E9 34 WITNESSES: I l/VI/E/VTOR AXEL R. LARSON, OF BRIDGEPORT, CONNECTICUT.

TRIPLE-NEEDLE SEWING-MACHINE.

Specification of Letters Patent.

Patented Feb. 1, 1916.

Application filed May 26, 1914. Serial No. 841,016.

' T o'alZ whom it may concern Be it known that I, AXEL R.- LARSON, a citizen of the United States, residing at Bridgeport, county of Fairfield, State of Connecticut, have invented an Improvement 'in Triple-Needle Sewing-Machines, of whlch type of machine in which the stitch is made by the employment of a rotating hook to pass the loop of needle thread about a bobbin lying within the hook;-this result I accomplish by the use of two hooks rotating in the horizontal plate, and a third hook rotating in the vertical plane and lying between the first-mentioned hooks.

With this object in view, the invention consists in certain constructions and in certain parts, improvements and combinations which will be hereinafter described, and then specifically pointed out in the claims hereunto appended.

In the accompanying drawings forming a part of this specification, Figure 1 is a view partly in elevation and partly in section of the portion of the stitch forming 'mechanism lying below the bed plate, and

the driving mechanism therefor; Fig. 1 a view of a bobbin case holding plate detached; Fig. 2 an inverted plan view corresponding with Fig. l, and Fig. 3 is an end elevation as seen from the left in Fig. 1.

10 denotes the needles which are in alinement and are carried by a vertically reciprocating shaft 11, 12 the bed plate and 13 a shaft for driving the rotating hooks, which is journaled in a-bearing 14, depending from the bed plate and in a sliding bearing block 15. The needle plate 16 is provided with three holes 17 suitably located to permit the needles to pass through. Below the plane of the needle plate and suitably located to engage the loops of thread formed by the outer needles are rotating hooks 18 and 19, lying in the horizontal plane, and between them is a rotating hook 20, lying in the vertical plane, which engages the loop of thread formed by the central needle. Hook 18 is carried by a vertical shaft 21 jeurnaled in a bearing 22 secured to the bed plate. This shaft also carries a bevel pinion 23 which meshes with a bevel pinion 24 on shaft 13. Hook 19 is carried by a vertical shaft 25 journaled in sliding bearing block 15. This .shaft also carries a bevel pinion 26 which meshes with a bevel pinion 27 having an elongated hub 28 which is keyed to shaft 13, so as to be rotated by said shaft but remaining free to be moved longitudinally thereon. Bearing block 15 is adapted to slide in ways 29 upon the under side of the bed plate and is additionally secured in place by screws 30 which pass through slots in the block and engage the bed plate. This bearing block is locked with the parts in operative position by means of a spring latch 31 carried by a holder 32, secured to the bearing block, and engaging a keeper 33 secured to the bed plate. -.As a means of securing adjustment of thesliding bearing block in exact operative position, a set screw 34 is provided in the block, the end ,of which engages one of the screws 30, said set screw being locked in position by a set nut. Hook 20 is carried by a short horizontal shaft 43 journaled in a bearing 44 which is secured to the bed plate. This shaft also carries .a gear wheel -15 which meshes with a gear wheel 46 carried by shaft 13.

As the special construction of the rotating hooks is not of the essence of the invention, I have not illustrated them in detail and do not consider it necessary for the purposes of thisvspecification to describe the' It is sufli operation of forming a stitch. cient to say that any" ordinary or preferred style of rotating hook may be used and is within the scope of the present invention.

35 denotes the feed bar which is 'shown as curved in both the vertical and horizontal planes in order to clear vertical hook 20 and its driving mechanism. The bobbins are not shown. The bobbin case corresponding with horizontal hook 18 is provided with a lug 36 which engages depending lugs 37 (one only being shown) on the needle plate, to hold said bobbin case against rotation. The bobbin case corresponding with vertical hook 20 is provided with lugs 38 (one only being shown), which engage opposite sides of a lug 39 depending from the needle plate to hold said bobbin case against'rotatiom In the case of horizontal hook 19. which is required to slide with bearing block 15, the corresponding bobbin case is held against rotation by means of a' lug 40 extending therefrom which engages. lugs 41 on an inverted U-shaped plate 42 which is secured to the bearing block, see Fig. 1 in connection with Fig. 1.

Access to horizontal book 18, in order to change bobbins or for any purpose whatever, isefiected by withdrawing a slide 47 in the bed plate. Access to horizontal hook 19 is effected by withdrawing a. slide 48 in the bed plate. In order to get access to ververtical thereto.

tical hook 20 in addition to withdrawing slide 48, the operator disengages latch 31 from its keeper and slides bearing block 15 and all the parts carried thereby, including hook 19, toward the left, as seen in Fig. 1, which leaves said vertical hook perfectly easy of access.

49 denotes a guard which is secured to bearing 44 and covers the entire upper halfof gearlwheel 45.-- It shouldbe understood that the terms horizontal and vertical as applied to the planes in which the hooks my invention I I tal plane and a hook rotating in the vertical plane and lying between said first-men tioned hooks, of a sliding bearing block by which one of the' horizontally rotating hooks is carried and a spring latch for locking said block in operative posltion.

2. In combination, a horlzontally rotating hook of the character described, a vertically rotating hook contiguous thereto, a horizontally rotating hook contiguous to the vertically rotating hook and opposite to the firstmentioned horizontally rotating hook, and

means for moving one of said horizontally rotating hooks out of operative position to permit acce s to the vertically rotating hook.

3. In a machine of the character described, the combination with two vertical andone horizontal hook carrying shafts, bevel pinions on the vertical shafts, and a gear wheel on the horizontal shaft, of a driving shaft, bevel pinions thereon engaging the pinions on the vertical shafts, a gear wheel engaging the gear wheel on the horizontal shaft and asliding bearing block in I which the driving shaft and one of the vertical shafts is journaled, one of the bevel pinions on the driving shaft being keyed thereto and moving longitudinally with the bearing block. i 4. In a machine of the character described, the combination with one horizontal and two vertical hook carrying shafts, a driving shaft and co-acting driving ele-" men-ts on said, shafts, .of a sliding bearing block in which the driving shaft and one of the vertical shafts is journaled, one ofthe driving elements on the driving shaft .belng keyed thereto and moving longitudinally with the bearing block, and means on the' bearing block for retaining said block and the parts carried thereby in operativegposi tion. In testimony whereof I aflix my'signatu r in' presence. oftwo witnesses.

Witnesses: H. W. MEADE, E. M. CU'LVER.

, AXEL B... LARSON. I 

